/* Copyright (c) 2020 XEPIC Corporation Limited */
/*
 * Copyright (c) 2002 Stephen Williams (steve@icarus.com)
 *
 *    This source code is free software; you can redistribute it
 *    and/or modify it in source code form under the terms of the GNU
 *    General Public License as published by the Free Software
 *    Foundation; either version 2 of the License, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 * USA.
 */

#include <assert.h>
#include <veriuser.h>
#include <vpi_user.h>

PLI_INT32 tf_typep(PLI_INT32 narg) {
  vpiHandle sys_h, argv, arg_h = 0;
  int rtn;

  assert(narg > 0);

  /* get task/func handle */
  sys_h = vpi_handle(vpiSysTfCall, 0);
  argv = vpi_iterate(vpiArgument, sys_h);

  /* find nth arg */
  while (narg > 0) {
    /* Watch that the argument is not out of range. */
    if (!(arg_h = vpi_scan(argv))) return TF_NULLPARAM;
    narg -= 1;
  }

  switch (vpi_get(vpiType, arg_h)) {
    case vpiConstant:
      switch (vpi_get(vpiConstType, arg_h)) {
        case vpiStringConst:
          rtn = TF_STRING;
          break;
        case vpiRealConst:
          rtn = TF_READONLYREAL;
          break;
        default:
          rtn = TF_READONLY;
          break;
      }
      break;

    case vpiIntegerVar:
    case vpiReg:
    case vpiMemoryWord:
      rtn = TF_READWRITE;
      break;

    case vpiRealVar:
      rtn = TF_READWRITEREAL;
      break;

    default:
      rtn = TF_READONLY;
      break;
  }

  vpi_free_object(argv);
  return rtn;
}
